Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (3): 830-836.doi: 10.13278/j.cnki.jjuese.20180274

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Normalized Total Gradient Method Based on Hartley Transform

Zhang Yachen1,2, Liu Cai1,2, Chen Guangyu3   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Key Laboratory of Applied Geophysics, Changchun 130026, China;
    3. Information and Technology Department, Northeast Oil and Gas Branch Sinopec, Changchun 130062, China
  • Received:2018-10-29 Online:2019-06-03 Published:2019-06-03
  • Supported by:
    Supported by National Natural Science Foundation of China (41430322)

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Abstract: The normalized total gradient method is a normalized calculation of the gravity total gradient mode in the lower half space, and its extreme value is used to obtain the distribution of geological bodies. The existing calculation methods have the disadvantages of low calculation accuracy and unstable results. In this study, the Hartley transform is used to realize the normalized total gradient of gravity, and a new cosine filter factor is introduced to suppress high frequency interference. In addition, the power of the cosine filter factor is designed to overcome the serious interference of deeper calculation depth,which is a function of the depth,and leads to more stable calculation results. The model test and actual data in Linglong Goldfield show that the proposed gravity normalized total gradient method has the advantages of fast calculation, high precision and strong stability, and has a good practical application value.

Key words: normalized total gradient, Hartley transform, cosine filter factor, power

CLC Number: 

  • P631.1
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